diff options
| author | Paul Burton <paul.burton@mips.com> | 2019-04-05 22:50:36 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-04-09 16:21:30 -0700 |
| commit | 9b6584e35f407a391de39938fd0b4fb29671924f (patch) | |
| tree | a0c653c452daa4462b38e6bc2a50c281474d98e5 /arch/mips/include/asm/jump_label.h | |
| parent | c838b580ca9dcf16b07aa72bb61a914e9db0fd2c (diff) | |
| download | linux-9b6584e35f407a391de39938fd0b4fb29671924f.tar.bz2 | |
MIPS: jump_label: Use compact branches for >= r6
MIPSr6 introduced compact branches which have no delay slots. Make use
of them for jump labels in order to avoid the need for a nop to fill the
branch or jump delay slot, saving 4 bytes of code for each static branch.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Diffstat (limited to 'arch/mips/include/asm/jump_label.h')
| -rw-r--r-- | arch/mips/include/asm/jump_label.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h index df04449b261b..3185fd3220ec 100644 --- a/arch/mips/include/asm/jump_label.h +++ b/arch/mips/include/asm/jump_label.h @@ -11,6 +11,7 @@ #ifndef __ASSEMBLY__ #include <linux/types.h> +#include <asm/isa-rev.h> #define JUMP_LABEL_NOP_SIZE 4 @@ -21,9 +22,14 @@ #endif #ifdef CONFIG_CPU_MICROMIPS -#define B_INSN "b32" +# define B_INSN "b32" +# define J_INSN "j32" +#elif MIPS_ISA_REV >= 6 +# define B_INSN "bc" +# define J_INSN "bc" #else -#define B_INSN "b" +# define B_INSN "b" +# define J_INSN "j" #endif static __always_inline bool arch_static_branch(struct static_key *key, bool branch) @@ -42,7 +48,7 @@ l_yes: static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) { - asm_volatile_goto("1:\tj %l[l_yes]\n\t" + asm_volatile_goto("1:\t" J_INSN " %l[l_yes]\n\t" ".pushsection __jump_table, \"aw\"\n\t" WORD_INSN " 1b, %l[l_yes], %0\n\t" ".popsection\n\t" |